Tips on FitBit, or activity trackers?

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Hi there, I have had a few people tell me about these devices that will track your activity. Everything from steps, stairs, calories burned to sleep patterns. The newest wrist band FitBit looks amazing and it syncs to MFP. My question is regarding the kind of smartphone I have and compatability. I have a Droid Galaxy S2. They only seem to work with the S3 and the iphones. Do you know if there are any that still work well (comparable to the FitBit with sleep thingy) but would be compatible with my phone? I would love to know how much rested sleep I am getting on a regular basis with my weird work hours. And i def want it to work with MFP. Thanks guys, you never know who will have the info you need on here. I appreciate the help! Its time to get past the plateau